I was invited as volunteer photographer for quite interesting event. Professional athletes had a goal: 600 km for 48 hours. Starting from Chengdu, passing through A Ba Mountain (4114 meters) and a way back through mountains. Due to weather conditions as well as unpredictable circumstations there are considerably few photos of athletes themselves, though landscapes there were great.
Take a look: http://photoslav.net/cycling-above-the-clouds-challenge-of-will – photos plus short description.
Apparently it was the most challenging track in the world. At least I was told so. Next year international competitions may take place there.